The word 'snow-bound' refers to being trapped or obstructed by snow. There are various synonyms that can be used to replace this word such as snowed-in, snowdrifts, snowed-up, snow-locked, and snow-trapped. 'Snowed-in' refers to being trapped in a place because of heavy snowfall, and 'snowdrifts' are large piles of snow that can block a path. 'Snowed-up' and 'snow-locked' suggest a situation where someone is unable to move because of the snow, while 'snow-trapped' indicates being stuck or enclosed by snow. These synonyms can be used in different contexts to express the same meaning as the word 'snow-bound'.