Serving or used in place of another.
Alternative
Statement that expresses a personal opinion or belief, or adds information.
Comment
To lend assistance or aid, or to give something to a common cause
Contribute
Central or essential
Core
To socialize or engage with someone else
Interact
A level in something that cannot be seen or touched, used to describe meaning
Layer
Deny the truth or existence of
Negate
To change or take action in response to something
React
To change the emphasis, direction, or focus of
Shift
To define or identify clearly
Specify
