one who sets fire / (by extension) one responsible for something's popularity, etc.

(product development) project

project (planned endeavour)

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

role, service, use / (card games, mahjong) hand, scoring combination

war; battle

duty, office / service / role, part

(archaic); duty; service / put to work, labor / war; battle