meteor shower vs meteor stream

meteor shower and meteor stream both are nouns.

Word	Noun	Adjective	Verb	Adverb
meteor shower	Yes	No	No	No
meteor stream	Yes	No	No	No

As nouns, meteor shower and meteor stream are synonyms defined as:

meteor shower and meteor stream: a transient shower of meteors when a meteor swarm enters the earth's atmosphere

meteor shower (noun)	meteor stream (noun)
a transient shower of meteors when a meteor swarm enters the earth's atmosphere	a transient shower of meteors when a meteor swarm enters the earth's atmosphere