analogy
A comparison of two pairs of words that have the same relationship, like hot : cold :: up : down.
relationship
How two words are connected: opposites, part and whole, tool and user, and so on.
formal word
A word used in serious or official situations, like receive instead of get.
informal word
A relaxed, everyday word, like kids instead of children.
Canadian English
The kind of English spoken and written in Canada, with some words, spellings and meanings of its own.