grandpa

As nouns the difference between grandpaw and grandpa

is that grandpaw is grandfather while grandpa is grandfather.

As nouns the difference between taxonomy and grandpa

is that taxonomy is the science or the technique used to make a classification while grandpa is (informal) grandfather.

Granpy is likely misspelled.

Granpy has no English definition.

As a noun grandpa

is grandfather.

As nouns the difference between grandpa and pop

is that grandpa is grandfather while pop is a loud, sharp sound as of a cork coming out of a bottle.

As a verb pop is

to burst (something): to cause to burst.

As an interjection pop is

sound made in imitation of the sound.

As an adjective pop is

popular.

As an acronym POP is

acronym of probability of precipitation|lang=en.