two vs brace

two and brace both are nouns.

Word	Noun	Adjective	Verb	Adverb
two	Yes	Yes	No	No
brace	Yes	No	Yes	No

As nouns, brace is a hyponym of two; that is, brace is a word with a more specific, narrower meaning than two:

two: the cardinal number that is the sum of one and one or a numeral representing this number
brace: two items of the same kind

Other hyponyms of two include craps, snake eyes, couple, couplet, distich, duad, duet, duo, dyad, pair, span, twain, twosome, yoke.

two (noun)	brace (noun)
one of the four playing cards in a deck that have two spots	a structural member used to stiffen a framework
the cardinal number that is the sum of one and one or a numeral representing this number	a carpenter's tool having a crank handle for turning and a socket to hold a bit for boring
	an appliance that corrects dental irregularities
	a support that steadies or strengthens something else
	elastic straps that hold trousers up
	a rope on a square-rigged ship that is used to swing a yard about and secure it
	either of two punctuation marks ({ or }) used to enclose textual material
	a set of two similar things considered as a unit
	two items of the same kind

two (adjective)	brace (adjective)
being one more than one

two (verb)	brace (verb)
	cause to be alert and energetic
	support by bracing
	support or hold steady and make steadfast, with or as if with a brace
	prepare (oneself), often but not necessarily for something unpleasant or difficult