splicer vs mechanical device

splicer and mechanical device both are nouns.

Word	Noun	Adjective	Verb	Adverb
splicer	Yes	No	No	No
mechanical device	Yes	No	No	No

As nouns, mechanical device is a hypernym of splicer; that is, mechanical device is a word with a broader meaning than splicer:

splicer: a mechanical device for joining two pieces of paper or film or magnetic tape
mechanical device: mechanism consisting of a device that works on mechanical principles

splicer (noun)	mechanical device (noun)
a mechanical device for joining two pieces of paper or film or magnetic tape	mechanism consisting of a device that works on mechanical principles
a worker who splices ropes together by interweaving strands
a woodworker who joins pieces of wood with a splice