1. Manner of articulation is the way in which a speech sound
is produced by the speech organs.
Diphthong refers to a union of two vowel sounds.
Consonant cluster is a sequence of two or more consonants.
Assimilation – When a speech sound changes, and becomes
more like another sound which follows or
precedes it.

2. Stress - The pronunciation of a word or syllable with more force than
the surrounding words or syllables.
Homonym – Words which are written in the same way and sound alike
but which have different meanings.
Synonym – A word which has the same, or nearly the same, meaning
as another word.

3. Antonym – A word which is opposite in meaning to another word.
Collocation – The way in which words are used together regularly.
Idiom – An expression which functions as a single unit an whose
meaning cannot be worked out its separate parts.