Jargon is the collective term for the words, expressions, technical terms etc. which are intelligible to the members of a specific group, social circle or profession, but not to the general public. E.g. Multiple Independently Targeted Re-entry Vehicle . A different social circle may recognise some of the same terms as slang or fail to understand them. E.g. Guiness is good for you. Don't say Brown, day Hovis.
Mottoes are usually more universal than slogans which relate more closely to a particular context.
A family of sounds which are phonetically similar. An allophone is one of several variants of speech sounds which constitute a phoneme. Redundancy in speech - Speech is said to be redundant when it contains more than one signal for the same aspect of meaning. Let's face it. What I mean is that if he could possibly have made it on time, it would have been better.