appreciate

As a noun taxonomy

is the science or the technique used to make a classification.

As a verb appreciate is

to be grateful or thankful for.

In transitive terms the difference between null and appreciate

is that null is to nullify; to annul while appreciate is to increase in value.

As a noun null

is a non-existent or empty value or set of values.

As an adjective null

is having no validity, "null and void.

As verbs the difference between appreciate and obliged

is that appreciate is to be grateful or thankful for while obliged is past tense of oblige.

As an adjective obliged is

under an obligation to do something for someone.

As a verb appreciate

is to be grateful or thankful for.

As a noun misappreciation is

a failure to correctly and completely understand; an incorrect notion or belief that is a result of such a failure.