formaldehyde vs aldehyde

formaldehyde and aldehyde both are nouns.

Word	Noun	Adjective	Verb	Adverb
formaldehyde	Yes	No	No	No
aldehyde	Yes	No	No	No

As nouns, aldehyde is a hypernym of formaldehyde; that is, aldehyde is a word with a broader meaning than formaldehyde:

formaldehyde: a colorless poisonous gas; made by the oxidation of methanol
aldehyde: any of a class of highly reactive chemical compounds; used in making resins and dyes and organic acids

Other hypernyms of formaldehyde include gas.

formaldehyde (noun)	aldehyde (noun)
a colorless poisonous gas; made by the oxidation of methanol	any of a class of highly reactive chemical compounds; used in making resins and dyes and organic acids