subspace vs topological space

subspace and topological space both are nouns.

Word	Noun	Adjective	Verb	Adverb
subspace	Yes	No	No	No
topological space	Yes	No	No	No

As nouns, topological space is a hypernym of subspace; that is, topological space is a word with a broader meaning than subspace:

subspace: a space that is contained within another space
topological space: (mathematics) any set of points that satisfy a set of postulates of some kind

Other hypernyms of subspace include mathematical space.

subspace (noun)	topological space (noun)
a space that is contained within another space	(mathematics) any set of points that satisfy a set of postulates of some kind