In linguistics, the grammar of a natural language is its set of structural constraints on speakers 'or writers' composition of clauses, phrases, and words. The term can also refer to the study of such constraints, a field that includes domains such as phonology, morphology, and syntax, often complemented by phonetics, semantics, and pragmatics. There are currently two different approaches to the study of grammar, traditional grammar and theoretical grammar.
The word consonant may be used ambiguously for both speech sounds and the alphabet letters used to write them. In English, these letters are B, C, D, F, G, J, K, L, M, N, P, Q, S, T, V, X, Z and often H, R, W, Y. In English orthography, the letters H, R, W, Y, and the digraph GH are used for both consonants and vowels. In articulatory phonetics, a consonant is a speech sound articulated with the complete or partial closure of the vocal tract.