Noun

1. annex, annexe, extension, wing, addition, add-on, improver

usage: an addition that extends a main building

Verb

1. annex, assume, usurp, seize, take over, arrogate

usage: take (territory) as if by conquest; "Hitler annexed Lithuania"

2. annex, append, add on, supplement, affix

usage: attach to

See also: annex (Dictionary)