- grammatical
- graphic
- grave
- govern
- government
- guttural
- hard
- heteroclite
- hiatus
- hiatuses
- homograph
- hyperbaton
- ideogram
- ideograph
- imitative
- imperfective
- impersonal
- implosive
- imperatival
- imperative
- imperfect
- implosion
- impropriety
- indeclinable
- inceptive
- inchoative
- indefinite
- inflectional
- inflexion
- inflexionless
- independent
- indicative
- infinitival
- inflection
- inflective
- initial
- indeclinableness
- indo-european
- infinitive
- infix
- inflect
- inflectionless
- inflexional
- intensive
- interdental
- interjectionalise
- interjectionalize
- instrumental
- interjection
- interjectional
- interrogative
- intervocalic
- intonation
- intransitive
- intransitiveness
- intonational
- inversion
- irregular
- irregularity
- isophone
- jussive
- itacism
- iterative
- labial
- labiodental
- latinism
- liaison
- liquid
- loan-translation
- locative
- macrosegment
- macron
- main clause
- masculine
- metathesis
- modal
- mode
- modernism
- modifiability
- modifiable
- modification
- modificative
- modifier
- modify
- mood
- morpheme
- morphemic
- mutation
- mute
- negative
- neuter
- nominal
- nominative
- nominatival
- noun
- notional
- numeral
- number
- objective
- open