inking pad vs inkpad

inking pad and inkpad both are nouns.

Word	Noun	Adjective	Verb	Adverb
inking pad	Yes	No	No	No
inkpad	Yes	No	No	No

As nouns, inking pad and inkpad are synonyms defined as:

inking pad and inkpad: a block of absorbent material saturated with ink; used to transfer ink evenly to a rubber stamp

Other synonyms of inking pad include pad, stamp pad.

inking pad (noun)	inkpad (noun)
a block of absorbent material saturated with ink; used to transfer ink evenly to a rubber stamp	a block of absorbent material saturated with ink; used to transfer ink evenly to a rubber stamp