Attempting, endeavoring.
encluded
courageous, fearless, daring
You can make it all one sentence by adding a colon. "Amy was looking up words in the dictionary, but was having trouble: she didn't know how to spell them." As for Amy's problem, there is no sure fix. You can try words lists, or a thesaurus (looking at words that mean the same thing), or by typing them into a browser or word processing program that has a spell-checker that suggests words.
Some Synonyms for mischief: misbehavior catastrophe vandalism high jinks for more look in a thesaurus website or a thesaurus itself.
abhor
encluded
your face is one
journey, quest, adventure
foolish, childish, or ridiculous
Nurse, nanny, aide, doctor.
courageous, fearless, daring
You may be looking for esteem here.
consumer, client, shopper, buyer, purchaser
Pure, unsoiled, immaculate, sterile, unstained, innocent.
syllables prefix suffix root word morphemes
The term for words that are different but mean the same thing is called a synonym. You will find synonyms in a thesaurus and quite possibly an updated dictionary.
Some synonyms for completed: done, over, finished, etc.