itch

nouns

a contagious skin infection caused by the itch mite; characterized by persistent itching and skin irritation
"he has a bad case of the itch"
a strong restless desire
"why this urge to travel?"
an irritating cutaneous sensation that produces a desire to scratch
is derived from

verbs

scrape or rub as if to relieve itching
"Don't scratch your insect bites!"
have or perceive an itch
"I'm itching--the air is so dry!"
is derived from
is a type of (narrower)
be the source of pain
cause to perceive an itch
"his skin itched"
have a strong desire or urge to do something
"She is itching to start the project"; "He is spoiling for a fight"