The Nahuan or Aztecan languages are those languages of the Uto-Aztecan language family that have undergone the sound change known as Whorf's Law changing the original /*t/ to before */a/. Subsequently some Nahuan languages have changed /tl/ back to /t/ or to /l/, but it can still be seen that the language went through a -tl stage.
The Nahuan are the extinct Pochutec language and the various Nahuatl dialects, including Pipil.
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“The very natural tendency to use terms derived from traditional grammar like verb, noun, adjective, passive voice, in describing languages outside of Indo-European is fraught with grave possibilities of misunderstanding.”
—Benjamin Lee Whorf (1897–1934)