forms present-participle adjectives: add “-ing” to a verb to form an adjective
forms nouns: person/thing that does something
-ant is a suffix of Latin origin used in medical terminology to form adjectives and nouns that describe agents, substances, or conditions that perform a particular action or possess a particular quality. It typically indicates something that acts upon, causes, or is characterized by the root word it modifies. In medical contexts, it frequently appears in terms describing drugs, substances, or anatomical features that carry out specific functions (e.g., stimulant = something that stimulates; irritant = something that irritates).