Testimonial
Part of speech: noun
Definition: A statement, especially one given under oath; testimony A written recommendation of someone's worth or character A tribute given in appreciation of someone's service etc. A match played in tribute to a particular player (who sometimes receives a proportion of the gate money).
Example sentence: It only serves to show what sort of person a man must be who can't even get testimonials. No, no; if a man brings references, it proves nothing; but if he can't, it proves a great deal.
Recommendation
Part of speech: noun
Definition: An act of recommendingThat which is recommendedA commendation or endorsement
Example sentence: You don't carry in your countenance a letter of recommendation.