irritate vs gravel

irritate is not a noun while gravel is a noun.

Word	Noun	Adjective	Verb	Adverb
irritate	No	No	Yes	No
gravel	Yes	No	Yes	No

As verbs, irritate and gravel are synonyms defined as:

irritate and gravel: cause annoyance in; disturb, especially by minor irritations

Other synonyms of irritate include annoy, bother, chafe, devil, get at, get to, nark, nettle, rag, rile, vex.

irritate (noun)	gravel (noun)
	rock fragments and pebbles

irritate (verb)	gravel (verb)
excite to an abnormal condition, or chafe or inflame	be a mystery or bewildering to
excite to some characteristic action or condition, such as motion, contraction, or nervous impulse, by the application of a stimulus	cover with gravel
cause annoyance in; disturb, especially by minor irritations	cause annoyance in; disturb, especially by minor irritations