What is an ?????? Word™?

Question

_{This is in the spirit of the What is a Word/Phrase™ series started by JLee with a special brand of Phrase™ and Word™ puzzles.}

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If a word conforms to a special rule, I call it an ?????? Word™.
Use the examples below to find the rule.

?????? Words™	Not ?????? Words™
think	hear
heavy	overweight
family	neighbor
native	endemic
anxiety	stress
mental	theoretical
anime	animation
myth	legend
knife	spoon
white	black
film	movie
html	javascript

These are not the only examples of ?????? Words™.

[The name I call these words is also hidden somewhere in the examples.]

What is the special rule these words conform to?

Answer 1

These words are

words that, in all caps, are written with only straight lines.

(THINK, HEAVY, FAMILY vs. HEAR, OVERWEIGHT, NEIGHBOR...)

Answer 2

I am not sure if this warrants its own answer, but I suspect you are calling them

Honest Words

This is because

The first letters of the first six words on the right spell honest, you said the name was "hidden somewhere in the examples, and the number of "?" is six, matching the length of honest.

The name and the property might not be related too directly because arguably the name is much easier to spot than the property, and should thus not give away too much of the actual puzzle.

EDIT: The connection might be via

Straightforward, which has a very similar meaning as honest, and also includes straight (as in straight lines).