155th vs hundred-and-fifty-fifth

155th and hundred-and-fifty-fifth both are adjectives.

Word	Noun	Adjective	Verb	Adverb
155th	No	Yes	No	No
hundred-and-fifty-fifth	No	Yes	No	No

As adjectives, 155th and hundred-and-fifty-fifth are synonyms defined as:

155th and hundred-and-fifty-fifth: the ordinal number of one hundred fifty-five in counting order

155th (adjective)	hundred-and-fifty-fifth (adjective)
the ordinal number of one hundred fifty-five in counting order	the ordinal number of one hundred fifty-five in counting order