the.com/carer

means Someone who regularly attends to another person's basic needs — feeding, washing, medicating, comforting — usually because that person can't fully do it themselves.

from Straightforward English: 'care' (Old English 'caru/cearu', meaning sorrow, anxiety, or a burdened concern for something) plus the agent suffix '-er'. Notice the ancestry — 'care' originally leaned toward grief and worry, not warmth. The affectionate sense of 'caring for' someone grew later, and 'carer' itself is a relatively modern label, formalized mainly in British English to name the unpaid or underpaid people doing the daily labor that love, when it's real, turns into.