tumbler vs turner

tumbler and turner both are nouns.

Word	Noun	Adjective	Verb	Adverb
tumbler	Yes	No	No	No
turner	Yes	No	No	No

As nouns, turner is a hyponym of tumbler; that is, turner is a word with a more specific, narrower meaning than tumbler:

tumbler (noun)	turner (noun)
pigeon that executes backward somersaults in flight or on the ground	cooking utensil having a flat flexible part and a long handle; used for turning or serving food
a glass with a flat bottom but no handle or stem; originally had a round bottom	one of two persons who swing ropes for jumpers to skip over in the game of jump rope
a movable obstruction in a lock that must be adjusted to a given position (as by a key) before the bolt can be thrown	a lathe operator
a gymnast who performs rolls and somersaults and twists etc.	a tumbler who is a member of a turnverein