back

> back
(verb)
abet, aid, countenance, favour, second, support, sustain.
go back, move back, retreat, withdraw.

> back
(adjective)
hindmost.

> back
(adverb)
in return, in consideration.
ago, gone, since.
aside, away, behind, by.
abaft, astern, backwards, hindwards, rearwards.

> back
(noun)
end, hind part, posterior, rear.