profession vs professing

profession and professing both are nouns.

Word	Noun	Adjective	Verb	Adverb
profession	Yes	No	No	No
professing	Yes	No	No	No

As nouns, profession and professing are synonyms defined as:

profession and professing: an open avowal (true or false) of some belief or opinion

profession (noun)	professing (noun)
an occupation requiring special education (especially in the liberal arts or sciences)	an open avowal (true or false) of some belief or opinion
an open avowal (true or false) of some belief or opinion
affirmation of acceptance of some religion or faith
the body of people in a learned occupation