streamer vs pennon

streamer and pennon both are nouns.

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

As nouns, streamer and pennon are synonyms defined as:

Other synonyms of streamer include pennant, waft.

streamer (noun)	pennon (noun)
long strip of cloth or paper used for decoration or advertising	wing of a bird
a long flag; often tapering	a long flag; often tapering
a newspaper headline that runs across the full page
light that streams