A word formed from the initial letters of other words, e.g. AIDS (acquired immune deficiency syndrome).
Adjectives express a quality or attribute of a noun: a happy child; a violent storm; an old car. Adjectives can also appear after the noun: the child is happy.
A phrase in which the main word is an adjective. The adjective may occur on its own in the phrase (happy, old, rich), or it may have a premodifier before it (very happy, quite old, extremely rich). Some adjective phrases may also have postmodifiers after the adjective (tired of waiting, happy to meet you).
A grammatically optional element in sentence structure. Adjuncts convey optional, additional information, including when something happened (Our guests arrived on Sunday.), where something happened (We met Paul outside the cinema.) and why something happened (Amy cried because she lost her doll.).
A subordinate clause which functions as an adjunct in sentence structure: Amy cried because she lost her doll; Although he is poor, he gives what he can to charity.