Synonyms of the word 
DIACHRONIC → HISTORICAL
diachronic
- adj. Occurring over or changing with time.
- adj. Of, pertaining to or concerned with changes that occur over time.
historical
- adj. Of, concerning, or in accordance with recorded history, (particularly) as opposed to legends, myths, and…
- adj. Of, concerning, or in accordance with the past generally.
- adj. Of, concerning, or in accordance with the scholarly discipline of history.
- adj. Forming compound adjectives with the meaning "historical/~" or "historically".
- n. A historical romance.
If you are interested in words, visit the following sites :
- wiktionary.org/diachronic For complete definition of a word
- 1word.ws/diachronic to play with words, suffixs, prefixs, etc.