later vs ulterior

later and ulterior both are adjectives.

Word	Noun	Adjective	Verb	Adverb
later	No	Yes	No	Yes
ulterior	No	Yes	No	No

As adjectives, later and ulterior are synonyms defined as:

Other synonyms of later include posterior.

later (adjective)	ulterior (adjective)
at or toward an end or late period or stage of development	lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed)
coming at a subsequent time or stage	beyond or outside an area of immediate interest; remote
	coming at a subsequent time or stage

later (adverb)	ulterior (adverb)
happening at a time subsequent to a reference time
at some eventual time in the future
comparative of the adverb `late'