Is nucleophile substitution reaction and nucleophilic addition elimination reactions the same?

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nucleophilic-addition
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#1

Is nucleophile substitution reaction and nucleophilic addition elimination reactions are meant same(In both the reactions a strong nucleophile is substituted instead of a weak nucleophile in a compound ).What is the difference between these two reactions?

#2

Nucleophilic substitution reaction is a reaction in which a Sp3 hybridised carbon atom has a good leaving group so that a strong nucleophile can replace it.
Nucleophilic addition reaction is a reaction in which
a nucleophile attack to the electron dificient bond like double bond to make two single bonds.

#3

The product is different.
Nucleophilic Substitution gives the product on same hybridization
Nucleophilic Elimination gives the product with different hybridization by breaking a sigma bond and forming another (pi)-bond.
That mean in elimination if the reactant is of sp3 hybridization it will now give a sp2 hybridized product. If it is sp2 hybridized reactant it will give a sp hybridized product. But,
Substitution will give sp3 product for sp3 reactant, sp2 product for sp2 reactant and so on.

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