dig up vs grub up

dig up and grub up both are verbs.

Word	Noun	Adjective	Verb	Adverb
dig up	No	No	Yes	No
grub up	No	No	Yes	No

As verbs, grub up is a hyponym of dig up; that is, grub up is a word with a more specific, narrower meaning than dig up:

Other hyponyms of dig up include grub out, nuzzle, disinter, exhume.

dig up (verb)	grub up (verb)
find by digging in the ground	dig up
remove, harvest, or recover by digging