afterwards

As adverbs the difference between afterwards and since

is that afterwards is (temporal location) at a later or succeeding time while since is from a specified time in the past.

As a preposition since is

from (time).

As a conjunction since is

from the time that.

In temporal location terms the difference between then and afterwards

is that then is soon afterward while afterwards is at a later or succeeding time.

As an adjective then

is being so at that time.

As a noun then

is that time.

As a conjunction then

is obsolete spelling of lang=en.

As a noun aftermath

is a second mowing; the grass which grows after the first crop of hay in the same season.

As an adverb afterwards is

at a later or succeeding time.

As an adverb afterwards

is at a later or succeeding time.

As a noun afterwords is

plural of afterword.

As a noun taxonomy

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

As an adverb afterwards is

(temporal location) at a later or succeeding time.

As adverbs the difference between whereafter and afterwards

is that whereafter is (formal) after which time while afterwards is (temporal location) at a later or succeeding time.

As adverbs the difference between afterwards and behind

is that afterwards is (temporal location) at a later or succeeding time while behind is at the back part; in the rear.

As a preposition behind is

at the back of.

As a noun behind is

the rear, back-end.

As an adverb afterwards

is (temporal location) at a later or succeeding time.

As an adjective aftermentioned is

mentioned afterwards.

As adverbs the difference between afterwards and arterwards

is that afterwards is (temporal location) at a later or succeeding time while arterwards is (obsolete) afterwards.