stupid vs pillock

stupid and pillock both are nouns.

Word	Noun	Adjective	Verb	Adverb
stupid	Yes	Yes	No	No
pillock	Yes	No	No	No

As nouns, stupid and pillock are synonyms defined as:

Other synonyms of stupid include dolt, dullard, poor fish, pudden-head, pudding head, stupe, stupid person.

stupid (noun)	pillock (noun)
a person who is not very bright	a person who is not very bright

stupid (adjective)	pillock (adjective)
lacking or marked by lack of intellectual acuity
lacking intelligence
in a state of mental numbness especially as resulting from shock