attendant vs accompanying

attendant is a noun but accompanying is not a noun.

Word	Noun	Adjective	Verb	Adverb
attendant	Yes	Yes	No	No
accompanying	No	Yes	No	No

As adjectives, attendant and accompanying are synonyms defined as:

attendant and accompanying: occurring with or following as a consequence

Other synonyms of attendant include collateral, concomitant, consequent, ensuant, incidental, resultant, sequent.

attendant (noun)	accompanying (noun)
an event or situation that happens at the same time as or in connection with another
someone who waits on or tends to or attends to the needs of another
a person who is present and participates in a meeting

attendant (adjective)	accompanying (adjective)
being present (at a meeting or event, etc.)	occurring with or following as a consequence
occurring with or following as a consequence