Suffix -ful -er

full of help

• helpful
• helper
• helply
• helpy

a person who fights

• fighter
• fightful
• fightly

a person who teaches

• teacher
• teachly
• teachful

a person who sings

• singer
• singful
• singly

doing something in a loud way

• loudly
• loudful
• louder

full of joy

• joyful
• joyly
• joyer

doing something close 

• closely
• closeful
• closer

full of power

• powerful
• powerer
• powerly

someone who farms

• farmer
• farmful
• farmly

doing something in a quick way

• quicker
• quickly
• quickful