All Arabic words in the Quran are divided into only 3 categories:
فِعْل
Actions in Time
Verbs & Actions
Words that describe an action and ARE tied to a specific time (Past, Present, or Command).
خَلَقَ
"He Created"
يَعْلَمُ
"He Knows"
قُلْ
"Say!"
اِسْم
Names of People & Things
Nouns & Names
Words that point to a person, place, thing, or quality. They are NOT tied to time.
اللَّه
"Allah"
كِتَاب
"Book"
عَالِم
"Knower"
حَرْف
The "Glue" (Connecting words)
Particles
Words that don't give a complete meaning on their own unless they are joined with an Ism or a Fil.
فِي
"In"
مِنْ
"From"
وَ
"And"