Main Difference
The main difference between Blintz and Crepe is that the Blintz is a food and Crepe is a type of very thin pancake.
Blintz
A blini (sometimes spelled bliny) (Russian: блины pl., diminutive: блинчики, blinchiki) or, sometimes, blin (more accurate as a single form of the noun), is a Russian pancake traditionally made from wheat or (more rarely) buckwheat flour and served with smetana, quark, butter, caviar and other garnishes. Its roots trace back to ancient Slavic rituals. They are also known as blintzes, crepes or palatschinke.
Some English dictionaries record usage of the forms blin as singular and blini or bliny as plural, which correspond to the originally Russian forms, but some dictionaries consider this usage so rare in English that they do not mention blin at all and only record the widespread modern regular usage of blini for the singular and blinis for the plural, for example the American Heritage, MacMillan, and Vocabulary.com dictionaries. Some cookbooks and restaurants use blin and blintchick as in Russian to refer to crêpes.
Blintzes are apparently an offshoot (an evolved or variant form) of blini. They are thin pancakes usually made of wheat flour (not buckwheat), folded to form a casing (as for cheese or fruit) and then sautéed or baked. Blini are among the most popular and most-eaten dishes in Russia.
Crepe
A crêpe or crepe ( (listen) or , French: [kʁɛp] (listen), Quebec French: [kʁaɪ̯p] (listen)) is a type of very thin pancake. Crêpes are usually of two types: sweet crêpes (crêpes sucrées) and savoury galettes (crêpes salées). Crêpes are served with a variety of fillings, from the simplest with only sugar to flambéed crêpes Suzette or elaborate savoury galettes. While crêpes are often associated with Brittany, a region in the northwest of France, their consumption is widespread in France, Belgium, Canada, and many parts of Europe, North Africa, and the Southern Cone of South America.
Blintz (noun)
A blini pancake, filled (often with sweet cheese) and folded, then fried and often served with sour cream, fruit, or a sweet sauce.
Crepe (noun)
A flat round pancake-like pastry from Lower Brittany, made with wheat.
Crepe (noun)
A soft thin light fabric with a crinkled surface.
Crepe (noun)
Crepe paper; thin, crinkled tissue paper.
Crepe (noun)
Rubber in sheets, used especially for shoe soles.
“The policeman wore crepe-soled shoes.”
Crepe (noun)
A death notice printed on white card with a background of black crepe paper or cloth, placed on the door of a residence or business.
Crepe (verb)
To crease (paper) in such a way to make it look like crepe paper
Crepe (verb)
To frizz (the hair).
Crepe (noun)
a light, thin fabric with a wrinkled surface
“a crêpe bandage”
Crepe (noun)
hard-wearing wrinkled rubber, used for the soles of shoes.
Crepe (noun)
a thin pancake.