Take the word tumble - by prefixing it with a single letter you get a whole new word stumble with a slightly different meaning.
When it occurred to me I tried thinking of other words like this but could not find any. Is this unique to this pair of words then? Also, any history of this pair of words will be welcome.
When two words differ by only one sound they are called minimal pairs. For a list, see here. I can't find the pair stumble / tumble in the list. That may be because the addition of a sound, rather than its replacement, may be a special case, or there may be a different term for them of which I am unaware.
In the style of Will Shortz:
Signs of a fever: ache and shake
Looking up: eye and high
Sea creatures: eel and seal
Give props: shout out
Have dinner at table: eat at your seat
Petroleum spill: oil soil
Metal packaging: in a tin
Medicine accident: pill spill
Misspeak: lip slip
Brown Christmas: no snow
Birds do it: wing swing
In the groin: low blow
Also in the groin: love glove
A shout out to my source: speech-language-therapy dot com
