I'm writing a multiple choice test (MCQ) and I'll add a page of extra questions. I'm hesitating between naming them "supplementary list/page of questions" and "supplemental list/page of questions", but I don't get the difference of meaning.
According to Wiktionary, they have distinct meaning and aren't considered synonyms:
supplemental (comparative more supplemental, superlative most supplemental)
- Acting to supplement.
supplementary (comparative more supplementary, superlative most supplementary)
- Additional; added to supply what is wanted.
I could potentially use alternative formulations like additional questions or extra questions, but my concern here is to understand the difference between adjectives supplemental and supplementary.
I tried to look at some well-reviewed conventions, like from unicode.org lists, but they use both terminologies without me understanding why: