offspring vs bastard

offspring and bastard both are nouns.

Word	Noun	Adjective	Verb	Adverb
offspring	Yes	No	No	No
bastard	Yes	Yes	No	No

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

offspring (noun)	bastard (noun)
any immature animal	derogatory term for a variation that is not genuine; something irregular or inferior or of dubious origin
something that comes into existence as a result	insulting terms of address for people who are stupid or irritating or ridiculous
the immediate descendants of a person	the illegitimate offspring of unmarried parents

offspring (adjective)	bastard (adjective)
	fraudulent; having a misleading appearance