What is Japanese word for the grammar term "verb base"?

In English language descriptions of the Japanese language verb conjugation for
"kau' for example, "ka" is listed as the stem. Base #1 is "wa" to which nai
can be added to make ka+wa+nai = kawanai. Base #2 is "i" to which masu can be
added to make ka+i+masu = kaimasu. Each base adds a hiragana ending in the
sound of "a" for base #1, "i" for base #2, "u" for base #3, "e" for base #4,
or "ou" for base #5. My question is; is there a Japanese word for this English
term "base". 語幹 ( _gokan_ ) has been suggested, but I think that refers to the
English term "stem", the unchanging part of the verb, in the above system.

_Kotae ga areba kanshin shimasu._
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grammar word-requests
What is Japanese for the grammar term "verb base"?
What you are looking for is probably the word "活用語尾" (Katsuyou Gobi).

That means the changing part that attaches to "語幹" (Gokan).

Check [this page](http://blog.livedoor.jp/aritouch/archives/3693722.html)
(written in Japanese) for the detail description and more examples.
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2015-11-17T07:00:56.757
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This
[page](http://www.kokugobunpou.com/%E7%94%A8%E8%A8%80/%E5%8B%95%E8%A9%9E-2-%E6%B4%BB%E7%94%A8%E3%81%A8%E3%81%9D%E3%81%AE%E7%A8%AE%E9%A1%9E/)
highlights in red the part right after the "語幹" (gokan) and calls it "活用語尾"
(katsuyou gobi), so I think it is the term you are looking for.

This [page](http://www.hello-school.net/harojapa006.htm) only describes names
two parts of the verb: "語幹" (gokan) and "活用語尾" (katsuyou gobi), and then all
of the different verb forms.
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