suds vs shaving soap

suds and shaving soap both are nouns.

Word	Noun	Adjective	Verb	Adverb
suds	Yes	No	Yes	No
shaving soap	Yes	No	No	No

As nouns, shaving soap is a hyponym of suds; that is, shaving soap is a word with a more specific, narrower meaning than suds:

suds: the froth produced by soaps or detergents
shaving soap: toiletry consisting of a preparation of soap and fatty acids that forms a rich lather for softening the beard before shaving

Other hyponyms of suds include shaving cream.

suds (noun)	shaving soap (noun)
a dysphemism for beer (especially for lager that effervesces)	toiletry consisting of a preparation of soap and fatty acids that forms a rich lather for softening the beard before shaving
the froth produced by soaps or detergents

suds (verb)	shaving soap (verb)
make froth or foam and become bubbly
wash in suds