junk vs trash

junk and trash both are nouns.

Word	Noun	Adjective	Verb	Adverb
junk	Yes	No	Yes	No
trash	Yes	No	Yes	No

As nouns, trash is a hypernym of junk; that is, trash is a word with a broader meaning than junk:

Other hypernyms of junk include rubbish, scrap.

As verbs, junk and trash are synonyms defined as:

Other synonyms of junk include scrap.

junk (noun)	trash (noun)
any of various Chinese boats with a high poop and lugsails	an amphetamine derivative (trade name Methedrine) used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant
the remains of something that has been destroyed or broken up	nonsensical talk or writing
	worthless people
	worthless material that is to be disposed of

junk (verb)	trash (verb)
dispose of (something useless or old)	express a totally negative opinion of
	dispose of (something useless or old)