Indo-Hittite vs Indo-European language

Indo-Hittite and Indo-European language both are nouns.

Word	Noun	Adjective	Verb	Adverb
Indo-Hittite	Yes	No	No	No
Indo-European language	Yes	No	No	No

As nouns, Indo-Hittite and Indo-European language are synonyms defined as:

Indo-Hittite and Indo-European language: the family of languages that by 1000 BC were spoken throughout Europe and in parts of southwestern and southern Asia

Other synonyms of Indo-Hittite include Indo-European.

Indo-Hittite (noun)	Indo-European language (noun)
the family of languages that by 1000 BC were spoken throughout Europe and in parts of southwestern and southern Asia	the family of languages that by 1000 BC were spoken throughout Europe and in parts of southwestern and southern Asia