linguistics1-6  Exercise 1: Naming the Relation
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Word relations:

  couch / sofa      synonymy (nearly the same meaning)
  hot / cold        gradable antonymy (opposites on a scale; warm and cool
                    lie in between)
  alive / dead      complementary antonymy (exactly one is true)
  buy / sell        converse (two sides of one transaction)
  tulip / flower    hyponymy (a tulip is a kind of flower; flower is the
                    hypernym)
  finger / hand     meronymy (a finger is a part of a hand)

Homonymy or polysemy?

  bank (money / river)   HOMONYMY. The two meanings are unrelated, and the
                         words have different origins.

  mouth (person / river) POLYSEMY. The river mouth is named by analogy with
                         the person's mouth (the place where something
                         comes out), so the senses are related.

  bat (animal / cricket) HOMONYMY. The animal and the sports equipment have
                         different origins and no shared meaning.

How to decide: ask whether a speaker feels the senses are connected. If a
dictionary lists them under one entry, the word is polysemous; if it gives
two separate entries, it counts as homonymy.