safety bicycle vs safety bike

safety bicycle and safety bike both are nouns.

Word	Noun	Adjective	Verb	Adverb
safety bicycle	Yes	No	No	No
safety bike	Yes	No	No	No

As nouns, safety bicycle and safety bike are synonyms defined as:

safety bicycle and safety bike: bicycle that has two wheels of equal size; pedals are connected to the rear wheel by a multiplying gear

safety bicycle (noun)	safety bike (noun)
bicycle that has two wheels of equal size; pedals are connected to the rear wheel by a multiplying gear	bicycle that has two wheels of equal size; pedals are connected to the rear wheel by a multiplying gear