Word groups are groups of related words. Some of the words on your vocabulary list are related or have similar definitions- for example, abase (to humiliate) is similar to "condescend" (to talk down to). As you make your vocabulary list, you should recognize the similarities between these related words. You may want to group them together, in a list of 'negative' words, or you may want to use them in a sentence together so that you remember that they have similar meanings.
Here is an example of a list of related 'word groups' or words that all mean the same thing. You can use this list as a starting point, but you will want to come up with your own list by going over the vocabulary that you don't know and seeing which words are similar or have the same definition.
BRAVE
audacious
brazen
courageous
dauntless
NOT BRAVE
Ambivalent
Capricious
Reticent
Timid
Vacillating
Wavering
HARD TO UNDERSTAND (CONFUSING)
abstruse
ambiguous
arcane
cryptic
enigmatic
esoteric
inscrutable
obscure
opaque
paradoxical
perplexing
recondite
turbid
EASY TO UNDERSTAND
articulate
cogent
eloquent
evident
limpid
lucid
pellucid
