companionship vs fellowship

companionship and fellowship both are nouns.

Word	Noun	Adjective	Verb	Adverb
companionship	Yes	No	No	No
fellowship	Yes	No	No	No

As nouns, companionship and fellowship are synonyms defined as:

Other synonyms of companionship include company, society.

companionship (noun)	fellowship (noun)
the state of being with someone	an association of people who share common beliefs or activities
	money granted (by a university or foundation or other agency) for advanced study or research
	the state of being with someone