Related words 火元 refers to the source or origin point of a fire (often used in fire investigations or to mean the household where a fire started), while 火口 is the more technical term for the burner opening or ignition point itself.
バーナー is the common everyday loanword for a burner device as a whole, while 火口 is the technical term for the burner's opening or nozzle specifically.
ノズル is the general loanword for any nozzle, while 火口 refers specifically to the nozzle or opening of a burner.
Don't confuse with Written identically as 火口 , かこう means a volcanic crater, while ひぐち (this entry) means a burner nozzle or the point where a fire started, so context and reading must distinguish them.
Counted with mouth · opening; hole; mouth (of a container) · entrance; exit; gate · speech; talk; gossip · taste; palate · mouth to feed · job opening; vacancy · invitation; summons · kind; sort; type · beginning; start · counter for mouthfuls, shares, stove burners · counter for swords, blades
Etymology Compound of 火 (hi, 'fire') and 口 (kuchi, 'mouth, opening'), literally 'fire mouth'. The reading ひぐち is a standard rendaku form.
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