Some languages have series of words that are related (related
in meaning and perhaps differing in part of speech) and form a sort of series
in which there is, for example, a vowel change from one word to the next.
This is known in linguistic circles by the German term Ablaut or Ablautsreihe (Ablaut series), and perhaps the best examples are found in German: Koch ('cook'), Küche ('kitchen'), Kuchen ('cake').
I have been trying to collect examples of Ablautsreihe in English and believe I have found a few.
- sing sang sung song
- hot heat
- feed food
- tell tale
- drip drop
- strike stroke
- hear heard
- knit knot
- sit seat
- cat kitten
- two twin twain
- drip drop
And maybe these (these are less clear):
- wood weed
- pick pack peck
- step steep
- dine dinner
