What is an Outs Word™?

Question

This puzzle 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 Outs word. Here is a list of examples:

OUTS	NOT OUTS
bar	allow
boil	freeze
cool	hot
guru	initiate
ingrate	grateful
lich	skeleton
rage	serenity
ruins	creates

And a CSV version:

OUTS, NOT OUTS
bar, allow
boil, freeze
cool, hot
guru, initiate
ingrate, grateful
lich, skeleton
rage, serenity
ruins, creates

QUESTION: What is the rule to tell whether a word is an Outs word or not? Why is it called an Outs word?

Answer 1

An Outs Word is a word which:

is an anagram of the starting letters of the name of a South American country. It is called an 'Outs Word' since 'Outs' is itself an anagram of the first four letters of 'SOUTH'.

This can be seen as follows:

bar --> BRAzil
boil --> BOLIvia
cool --> COLOmbia
guru --> URUGuay
ingrate --> ARGENTIna
lich --> CHILe
rage --> ARGEntina
ruins --> SURIName

The 'Not Outs Words' do not comply with this rule.

Just for fun, a further topical example for this site would be:

REP, from PERu!