The highest scoring word in Words With Friends is JOINING with a total of 17 points.
Synonyms: connect, unite, fix, affix, attach, add, annex, fasten, stick, glue, fuse, knit, weld, amalgamate, consolidate, combine, bond, append, link, bridge, secure, lock, make fast, tie, bind, string, lash, couple, marry, pair, yoke, team, chain, merge, dovetail, splice, blend