One way to hold comforter: it is comfort with -er stuck on the end, so it names whatever takes the cold, the sad or the sore edge off you. The word never says how. Sometimes the answer is a person who sits down beside you and says very little. Sometimes it is a thing you pull around your body — the thick cover on a bed, or wool wound twice round a neck in the snow. Point at the source of the comfort, and you have used the word.
From the word’s history
Wiktionary traces comforter through Middle English comfortour and Anglo-Norman confortour to Old French conforter, and refers the reader to comfort. So the -er shape is visible all the way back: the one that comforts.
字源資料把 comforter 追到中古英文 comfortour、盎格魯諾曼語 confortour，再到古法文 conforter，並指向 comfort 這個字。也就是說，「安慰的那一個」這個結構從一開始就在，後來才分別落在人、被子和圍巾身上。
Wiktionary/kaikki extract supplied in this evidence packet (source_ref kaikki:3f6f69a190036ae4:1291264196): 'From Middle English comfortour et al, from Anglo-Norman confortour, from Old French conforter. See comfort.'
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