caveman; troglodyte

even if one says

to use / to employ / to make use of, to apply / to spend

way; method; manner

discovery

to discover

fire / a flame / cooking fire / a firestarter / sparks / light (matches or lighter)

to say, to tell somebody / to call, to name, to give a name / to cry, to call, to make a noise (such as an animal)

past tense and perfective aspect of 言う (iu, yū) [godan]

nonetheless, although, be that as it may