impulse vs itchy feet

impulse and itchy feet both are nouns.

Word	Noun	Adjective	Verb	Adverb
impulse	Yes	No	No	No
itchy feet	Yes	No	No	No

As nouns, itchy feet is a hyponym of impulse; that is, itchy feet is a word with a more specific, narrower meaning than impulse:

Other hyponyms of impulse include abience, adience, death instinct, death wish, Thanatos, wanderlust.

impulse (noun)	itchy feet (noun)
the act of applying force suddenly	very strong or irresistible impulse to travel
an impelling force or strength
the electrical discharge that travels along a nerve fiber
(electronics) a sharp transient wave in the normal electrical state (or a series of such transients)
a sudden desire
an instinctive motive