"词形变化表" can be translated into English as "a table of word forms" or "a morphological paradigm table".
"A table of word forms" is a straightforward and commonly used expression that clearly conveys the idea of a table listing different forms of a word.
"A morphological paradigm table" is a more technical and precise term used in linguistics to refer to a systematic presentation of all the inflected forms of a word, including its base form, conjugations, declensions, etc.
Choose the expression that best fits your context and audience.