twenty-seventh vs 27th

twenty-seventh and 27th both are adjectives.

Word	Noun	Adjective	Verb	Adverb
twenty-seventh	No	Yes	No	No
27th	No	Yes	No	No

As adjectives, twenty-seventh and 27th are synonyms defined as:

twenty-seventh (adjective)	27th (adjective)
coming next after the twenty-sixth in position	coming next after the twenty-sixth in position