forty-eighth vs 48th

forty-eighth and 48th both are adjectives.

Word	Noun	Adjective	Verb	Adverb
forty-eighth	No	Yes	No	No
48th	No	Yes	No	No

As adjectives, forty-eighth and 48th are synonyms defined as:

forty-eighth and 48th: the ordinal number of forty-eight in counting order

forty-eighth (adjective)	48th (adjective)
the ordinal number of forty-eight in counting order	the ordinal number of forty-eight in counting order