streamer vs pennant

streamer and pennant both are nouns.

Word	Noun	Adjective	Verb	Adverb
streamer	Yes	No	No	No
pennant	Yes	No	No	No

As nouns, streamer and pennant are synonyms defined as:

Other synonyms of streamer include pennon, waft.

streamer (noun)	pennant (noun)
long strip of cloth or paper used for decoration or advertising	a long flag; often tapering
a long flag; often tapering	a flag longer than it is wide (and often tapering)
a newspaper headline that runs across the full page	the award given to the champion
light that streams