1) Linguistics 
• (n.) The science of tongues or languages; comparative philology; glossology.
Glot·tol'o·gy noun [ Greek ..., ..., the tongue + -logy .] The science of tongues or languages; comparative philology; glossology. 
Type: Term Pronunciation: glo-tol′ŏ-jē Synonyms: glossology
glottology 1. The study of linguistics or the systematic study of a particular language or of languages. 2. The science of the definitions and explanations of terms. 3. The study of the tongue and the conditions, or diseases, affecting it.
linguistics.