【Dower】 , 【endow】 , 【endue】 are comparable when meaning to furnish or provide with a gift.

【Dower】 specifically denotes the provision of the dowry which a woman brings to a husband in marriage. It may also imply the bestowal of a gift, talent, or good quality.

【Endow】 in its basic sense implies the bestowing of money or property on a person or institution for its support or maintenance.

Like  【dower】 it may be extended to the giving of any good thing, often with a suggestion of enhancing or enriching the recipient.

【Endue】 may mean to clothe or invest with something (as a garment, a dignity, a right, or a possession).

【Endue】 has become so confused with 【endow】 in its extended sense of to bestow upon one a faculty, power, or other spiritual or mental gift that it is difficult to trace any differences in meaning between the two words.

But 【endow】  in precise use usually implies a permanent enriching, and 【endue】 an investing or clothing (either temporarily or permanently) with a specific quality or character.