neck vs sternocleidomastoid

neck and sternocleidomastoid both are nouns.

Word	Noun	Adjective	Verb	Adverb
neck	Yes	No	Yes	No
sternocleidomastoid	Yes	No	No	No

neck (noun)	sternocleidomastoid (noun)
an opening in a garment for the neck of the wearer; a part of the garment near the wearer's neck	one of two thick muscles running from the sternum and clavicle to the mastoid and occipital bone; turns head obliquely to the opposite side; when acting together they flex the neck and extend the head
a narrow part of an artifact that resembles a neck in position or form
the part of an organism (human or animal) that connects the head to the rest of the body
a cut of meat from the neck of an animal
a narrow elongated projecting strip of land

neck (verb)	sternocleidomastoid (verb)
kiss, embrace, or fondle with sexual passion