Inflection is the title for the extra letter or letters attached to nouns, verbs, and adjectives in their various grammatical structures. Nouns are turned in the plural, verbs are turned in the different tenses, and adjectives are turned in the relative.
Fentanyl is a synthetic opioid that is up to 50 times stronger than heroin and 100 times stronger than morphine. It is a major contributor to fatal and nonfatal overdoses in the U.S.