hog plum vs wild plum

hog plum and wild plum both are nouns.

Word	Noun	Adjective	Verb	Adverb
hog plum	Yes	No	No	No
wild plum	Yes	No	No	No

As nouns, hog plum and wild plum are synonyms defined as:

hog plum and wild plum: fruit of the wild plum of southern United States

As nouns, wild plum is a hypernym of hog plum; that is, wild plum is a word with a broader meaning than hog plum:

hog plum: small native American shrubby tree bearing small edible yellow to reddish fruit
wild plum: an uncultivated plum tree or shrub

Other hypernyms of hog plum include wild plum tree.

hog plum (noun)	wild plum (noun)
fruit of the wild plum of southern United States	fruit of the wild plum of southern United States
yellow oval tropical fruit	an uncultivated plum tree or shrub
small native American shrubby tree bearing small edible yellow to reddish fruit
tropical American tree having edible yellow fruit