"Context clues are very important for broadly comprehending text as well as for specifically learning new words. Instruction in context problem solving pays great dividends. It's akin to the old adage about catching fish for a man as opposed to teaching that man how to fish." (Greenwood, S. C., & Flanigan, F., 2007, p. 249)
Within the context of this document, vocabulary is used to describe the meaning of words known in isolation. Semantics, on the other hand, is used to describe the process of connecting words with other words by meaning. This would include knowing word meanings within the context surrounding words in a sentence or phrase, being able to map or web words connected by meaning, being able to arrange gradients of meaning (happy, pleased, disappointed, upset, livid), being able to gain meaning from multiword semantic units such as idioms, cliches, expressions, phrases, and metaphors.