disinfectant vs germicidal

disinfectant is a noun but germicidal is not a noun.

Word	Noun	Adjective	Verb	Adverb
disinfectant	Yes	Yes	No	No
germicidal	No	Yes	No	No

As adjectives, disinfectant and germicidal are synonyms defined as:

disinfectant and germicidal: preventing infection by inhibiting the growth or action of microorganisms

Other synonyms of disinfectant include bactericidal.

disinfectant (noun)	germicidal (noun)
an agent (as heat or radiation or a chemical) that destroys microorganisms that might carry disease

disinfectant (adjective)	germicidal (adjective)
preventing infection by inhibiting the growth or action of microorganisms	preventing infection by inhibiting the growth or action of microorganisms