It is probably a verb. If it describes something like "it was a leaking can" then it could be an adjective because it describes what kind of can.
Leak is a noun and a verb.
Noun: That faucet has a leak.
Verb: The toilet leaks, as well.
part of speech
Adjective
What part of speech is thaw
The part of speech for oscillate is verb.
An adjective is a part of speech.
part of speech
The part of speech for this particular word is a noun.
It is leaking and overheating because a part has failed.
Replace the part that is leaking
what part of speech is beneath
what part of speech is work
adverb
Replace the leaking part
Sashay is a verb. It means to walk in an exaggerated, showy manner, often with hip swaying.
"Did not" or "didn't" is a contraction of the auxiliary verb "did" and the adverb "not," forming a negative past tense construction in English.
It could be the coolant overflow tank that is leaking.
The word speech is a noun.