pinion vs pennon

pinion and pennon both are nouns.

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

As nouns, pinion and pennon are synonyms defined as:

pinion (noun)	pennon (noun)
wing of a bird	wing of a bird
any of the larger wing or tail feathers of a bird	a long flag; often tapering
a gear with a small number of teeth designed to mesh with a larger wheel or rack

pinion (verb)	pennon (verb)
cut the wings off (of birds)
bind the arms of