VOA慢速英语:Six Differences Between British and American English

collective noun – n.  a word which refers to a collection of things taken as a whole.

auxiliary verb – n.  a word used in construction with and preceding certain forms of other verbs, as infinitives or participles, to express distinctions of tense, aspect, mood, etc

modality– n. expressing ability, necessity, possibility, permission or obligation.

lexicographer – n. someone who writes dictionaries

inconsistency – n.  the quality or fact of not staying the same at different times

exaggerate – v. to think of or describe something as larger or greater than it really is