epochal vs epoch-making

epochal and epoch-making both are adjectives.

Word	Noun	Adjective	Verb	Adverb
epochal	No	Yes	No	No
epoch-making	No	Yes	No	No

As adjectives, epochal and epoch-making are synonyms defined as:

epochal and epoch-making: highly significant or important especially bringing about or marking the beginning of a new development or era

epochal (adjective)	epoch-making (adjective)
highly significant or important especially bringing about or marking the beginning of a new development or era	highly significant or important especially bringing about or marking the beginning of a new development or era