Semantically compounds may be non-idiomatic and idiomatic.
Compounds are non-idiomatic when they are motivated morphologically, e.g., Suitcase is a sum of meanings of the stems this compound word consists of (the meaning of each stem is retained).
When the compound is not motivated morphologically, it is idiomatic. The meaning of each component is either lost or weakened. It has a transferred meaning, e.g., Butterball – is not “a ball made of butter”, it is “someone who is fat, especially child”.
Minor Types of Word-formation
Minor types of modern word-formation are shortening, blending, acronymy, sound interchange, sound imitation, distinctive stress, back-formation, and reduplication.
· syncope – the middle part of the word is clipped, e.g. madam → ma'am; specs → spectacles
· apocope – the final part of the word is clipped, e.g. professor → prof, vampire → vamp;
· both initial and final, e.g. influenza → flu, detective → tec.
Minor Types of Word-formation
Polysemantic words are usually clipped in one meaning only. E.g., doctor →1) someone who is trained to treat people who are ill; 2) someone who holds the highest level of degree given by a university. Thus, it can be clipped only in the first meaning, e.g. doc.
There can be distinguished homonyms, so that one and the same sound and graphical lexical unit may represent different words,