participle
noun
par·ti·ci·ple
| \ ˈpär-tə-ˌsi-pəl
, Britain also pär-ˈti-si-pəl, pər-, pə-\
, Britain also pär-ˈti-si-pəl, pər-, pə-\
Definition of participle
: a word having the characteristics of both verb and adjective
especially
: an English verbal form that has the function of an adjective and at the same time shows such verbal features as tense and voice and capacity to take an object
In "the finished product," the word "finished" is a participle formed from the verb "finish."