thing vs horror

thing and horror both are nouns.

Word	Noun	Adjective	Verb	Adverb
thing	Yes	No	No	No
horror	Yes	No	No	No

As nouns, horror is a hyponym of thing; that is, horror is a word with a more specific, narrower meaning than thing:

thing (noun)	horror (noun)
a separate and self-contained entity	something that inspires horror; something horrible
an action	intense aversion
an artifact	intense and profound fear
an entity that is not named specifically
any attribute or quality considered as having its own existence
a special abstraction
a special objective
a vaguely specified concern
a statement regarded as an object
an event
a persistent illogical feeling of desire or aversion
a special situation