The term use to is typically employed as a verb to imply the utilization of a tool, device or implement for purposes of accomplishing a task. E.g.
"This is the computer I use to write essays."
Accustomed to or tolerant of
“I'm used to his bad jokes now.”
Being accustomed to
Knowledgeable as a result of previous exposure to a given subject
Physically and mentally dependent on a particular substance
Was or were habitually accustomed to