48th vs forty-eighth

48th and forty-eighth both are adjectives.

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

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

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

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