The type of stress that differentiates words like ‘import’ (noun) and ‘import’ (verb) in English is called "word stress" or more specifically, "contrastive stress" in noun-verb pairs."
In English, many two-syllable words change meaning based on stress placement.
Nouns usually have stress on the first syllable → 'IMport (/ˈɪm.pɔːrt/) (a thing that is brought in)
Verbs usually have stress on the second syllable → im'PORT (/ɪmˈpɔːrt/) (the action of bringing in goods)