a support build against a wall

brace, support

the verb 'be' when used to join a subject to its compliment, as in 'The baby is a boy', 'It is Thursday today'

intersection, juncture

the mark ( - ) used to join two words together, as in Anglo-French, between syllables, as in co-op, or to divide a word at the end of a written or printed line, as in hy-phen

intersection, juncture

the act of supporting or being supported; something that supports weight; money etc to live on; to bear the weight of (something); keep (something) in place

something that holds up structure

(an instance of) joining or uniting and being joined; a nation formed by joining a group of countries or states

merger, joining