sick of vs fed up

sick of and fed up both are adjectives.

Word	Noun	Adjective	Verb	Adverb
sick of	No	Yes	No	No
fed up	No	Yes	No	No

As adjectives, sick of and fed up are synonyms defined as:

Other synonyms of sick of include disgusted, sick, tired of.

sick of (adjective)	fed up (adjective)
having a strong distaste from surfeit	having a strong distaste from surfeit