The difference between Nice and Pleasant

When used as nouns, nice means niceness, whereas pleasant means a wit.

When used as adjectives, nice means pleasant, satisfactory, whereas pleasant means giving pleasure.

Nice is also adverb with the meaning: nicely.

Nice is also verb with the meaning: to run a process with a specified (usually lower) priority.

check bellow for the other definitions of Nice and Pleasant

Nice as an adjective:

Pleasant, satisfactory.
Nice as an adjective:

Of a person: friendly, attractive.
Nice as an adjective:

Respectable; virtuous.

Examples:

"What is a nice person like you doing in a place like this?"
Nice as an adjective:

With "and", shows that the given adjective is desirable: pleasantly.

Examples:

"The soup is nice and hot."
Nice as an adjective (obsolete):

Silly, ignorant; foolish.
Nice as an adjective (now, rare):

Particular in one's conduct; scrupulous, painstaking; choosy.
Nice as an adjective (obsolete):

Particular as regards rules or qualities; strict.
Nice as an adjective:

Showing or requiring great precision or sensitive discernment; subtle.
Nice as an adjective (obsolete):

Easily injured; delicate; dainty.
Nice as an adjective (obsolete):

Doubtful, as to the outcome; risky.

Nice as an adverb (colloquial):

Nicely.

Examples:

"Children, play nice."

"He dresses real nice."

Nice as a verb (transitive, computing, Unix):

To run a process with a specified (usually lower) priority.

Pleasant as an adjective:

Giving pleasure; pleasing in manner.

Examples:

"We had a pleasant walk around the town."

"It wasn't so hot outside, but pleasant enough to have lunch in the garden."
Pleasant as an adjective (obsolete):

Facetious, joking.