Lao-tse vs Laozi

Lao-tse and Laozi both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lao-tse	Yes	No	No	No
Laozi	Yes	No	No	No

As nouns, Lao-tse and Laozi are synonyms defined as:

Lao-tse and Laozi: Chinese philosopher regarded as the founder of Taoism (6th century BC)

Other synonyms of Lao-tse include Lao-tzu, Lao-zi.

Lao-tse (noun)	Laozi (noun)
Chinese philosopher regarded as the founder of Taoism (6th century BC)	Chinese philosopher regarded as the founder of Taoism (6th century BC)