trash collection vs trash pickup

trash collection and trash pickup both are nouns.

Word	Noun	Adjective	Verb	Adverb
trash collection	Yes	No	No	No
trash pickup	Yes	No	No	No

As nouns, trash collection and trash pickup are synonyms defined as:

trash collection and trash pickup: the collection and removal of garbage

Other synonyms of trash collection include garbage collection, garbage pickup.

trash collection (noun)	trash pickup (noun)
the collection and removal of garbage	the collection and removal of garbage