shoulder joint vs trunk

shoulder joint and trunk both are nouns.

Word	Noun	Adjective	Verb	Adverb
shoulder joint	Yes	No	No	No
trunk	Yes	No	No	No

shoulder joint (noun)	trunk (noun)
a ball-and-socket joint between the head of the humerus and a cavity of the scapula	a long flexible snout as of an elephant
	luggage consisting of a large strong case used when traveling or for storage
	compartment in an automobile that carries luggage or shopping or tools
	the body excluding the head and neck and limbs
	the main stem of a tree; usually covered with bark; the bole is usually the part that is commercially useful for lumber