testimonial vs testimony

testimonial and testimony both are nouns.

Word	Noun	Adjective	Verb	Adverb
testimonial	Yes	Yes	No	No
testimony	Yes	No	No	No

As nouns, testimonial and testimony are synonyms defined as:

testimonial (noun)	testimony (noun)
something that recommends (or expresses commendation of) a person or thing as worthy or desirable	a solemn statement made under oath
something given or done as an expression of esteem	an assertion offering firsthand authentication of a fact
something that serves as evidence	something that serves as evidence

testimonial (adjective)	testimony (adjective)
of or relating to or constituting testimony
expressing admiration or appreciation