Words That Start With OS

There are over 360 words that begin with OS in English. From 2-letter words to 15-letter entries, find OS-words grouped and sortable by length below, all valid in Scrabble, Wordle, and Words With Friends. You can also see five letter words starting with OS.

2-Letter Words Starting With OS

Short high-frequency OS-words:

3-Letter Words Starting With OS

Short high-frequency OS-words:

ose

See all 3-letter OS-words

4-Letter Words Starting With OS

Common 4-letter OS-words:

osar

oses

oshi

ossa

osso

See all 4-letter OS-words

5-Letter Words Starting With OS

Common 5-letter OS-words:

oscar

oshac

osier

osmic

osmol

ossia

ostia

See all 5-letter OS-words

6-Letter Words Starting With OS

Common 6-letter OS-words:

oscars

oscine

oscula

oscule

osetra

oshacs

osiers

osmate

osmics

osmium

osmole

osmols

osmose

osmous

ossein

ossias

osteal

ostent

ostial

ostomy

See all 6-letter OS-words

7-Letter Words Starting With OS

Common 7-letter OS-words:

osiered

osmiums

osmolar

osmosed

osmoses

osmunds

osseter

ossetra

ossicle

ossific

ossuary

ostents

osteoid

osteoma

osteria

ostiary

ostiate

ostlers

ostmark

ostrich

See all 7-letter OS-words

8-Letter Words Starting With OS

Common 8-letter OS-words:

oscitate

osculant

osculate

osieries

osmiates

osmosing

osseters

ossetras

ossifier

ossobuco

osteitis

ostented

osteogen

osteomas

ostinato

ostiolar

ostioles

ostomate

ostomies

ostreger

See all 8-letter OS-words

9-Letter Words Starting With OS

Common 9-letter OS-words:

oscillate

oscitancy

oscitates

osnaburgs

ossatures

osseously

ossicones

ossicular

ossifiers

ossifrage

ossifying

ossuaries

osteocyte

osteoderm

ostleress

ostomates

ostosises

ostracean

ostracism

ostregers

See all 9-letter OS-words

10-Letter Words Starting With OS

Common 10-letter OS-words:

oscillator

oscillated

osculatory

osmidrosis

osmolality

osmometers

osmometric

osmophobia

osteitises

ostensoria

osteoclast

osteocolla

osteoderms

osteogenic

osteophyte

osteotomes

ostracised

ostracisms

ostracized

ostracizes

See all 10-letter OS-words

11-Letter Words Starting With OS

Common 11-letter OS-words:

oscillative

oscillators

oscillatory

oscitations

osculations

ostentation

osteocollas

osteodermal

osteogenous

osteologies

osteopathic

osteopenias

osteophytic

osteoplasty

osteotomies

ostracizers

ostracizing

ostracodous

ostreophagy

ostrichisms

See all 11-letter OS-words

12-Letter Words Starting With OS

Common 12-letter OS-words:

oscillations

oscillograms

oscillograph

oseltamivirs

osmolarities

ossification

osteichthyan

ostentations

osteoblastic

osteogeneses

osteogenesis

osteologists

osteopathist

osteoplastic

osteoporotic

osteosarcoma

osteospermum

ostracisable

ostracizable

ostreophages

See all 12-letter OS-words

13-Letter Words Starting With OS

Common 13-letter OS-words:

oscillational

oscillographs

oscillography

oscilloscopic

ossifications

osteichthyans

ostensibility

ostensiveness

osteofibrosis

osteographies

osteomyelitis

osteonecrosis

osteonecrotic

osteopathists

osteopetroses

osteopetrosis

osteoplasties

osteospermums

ostreiculture

ostreophagies

See all 13-letter OS-words

14-Letter Words Starting With OS

Common 14-letter OS-words:

oscillographic

osmometrically

osmoregulation

osmoregulatory

ostentatiously

osteoarthritic

osteoarthritis

osteoarthroses

osteoarthrosis

osteodermatous

osteologically

osteosarcomata

ostreicultures

See all 14-letter OS-words

15-Letter Words Starting With OS

Common 15-letter OS-words:

oscillographies

osmoregulations

ostensibilities

osteoarthritics

osteomyelitides

osteomyelitises

osteopathically

ostreiculturist

See all 15-letter OS-words

360 Common Words Starting with OS

Most Common Length

Avg Scrabble Score

(out of 25)

Most Common Ending

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What is the highest scoring word in
Scrabble that starts with OS?

25 Points

The highest scoring word in Scrabble that starts with OS is osteopathically with a total of 25 points.

O 1

S 1

T 1

E 1

O 1

P 3

A 1

T 1

H 4

I 1

C 3

A 1

L 1

Y 4

Words that begin with OS are commonly used for word games like Scrabble and Words with Friends. This list will help you to find the top scoring words to beat the opponent. You can also find a list of all words that end in OS and words with OS. Try our five letter words starting with OS page if you’re playing Wordle-like games or use the New York Times Wordle Solver for finding the NYT Wordle daily answer.

FAQ Words That Start With OS

How many words starting with OS are in the English dictionary?

There are 360 words in the English dictionary that start with OS, and most of them are 10 letters long (56 words of that length).
What's the longest word starting with OS?

The longest word starting with OS is "osteomyelitides" at 15 letters long. If you're looking for a more everyday word, "oscillator" is the longest common word starting with OS.
Are there any rare words starting with OS worth more in Scrabble?

Yes. Uncommon words like "ostracizable", "ostracizer", "ostracize", "ostracizing" start with OS and can score big thanks to their unusual letters. "ostracizable" is worth 25 points in Scrabble before any bonus tiles.
What are the most common words starting with OS?

Most words starting with OS are 10 letters long, including everyday words like "oscillator", "oscillated", "osculatory", "osmidrosis", "osmolality".

Next to Words Start With OS

Explore words by letter combinations to grow your vocabulary.