hundred-and-fifty-fifth vs 155th

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

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

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

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

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