froth vs suds

froth and suds both are nouns.

Word	Noun	Adjective	Verb	Adverb
froth	Yes	No	Yes	No
suds	Yes	No	Yes	No

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

Other hyponyms of froth include shaving foam, head, lather, lather, soapsuds, spume, white water, whitewater.

As verbs, froth and suds are synonyms defined as:

Other synonyms of froth include spume.

froth (noun)	suds (noun)
a mass of small bubbles formed in or on a liquid	a dysphemism for beer (especially for lager that effervesces)
	the froth produced by soaps or detergents

froth (verb)	suds (verb)
exude or expel foam	make froth or foam and become bubbly
become bubbly or frothy or foaming	wash in suds
make froth or foam and become bubbly