If you look up the definition of sucre, you’ll see it is a noun meaning sugar.

Sucré however, according to the dictionary is an adjective equivalent to sweetened / sweet. Example:

• This juice is very sweet! (Ce jus est très sucré)
• Sweetened milk (Du lait sucré)

Sucré can have other meanings:

• Act as an adverb: ‘Manger sucré’ (ie: ‘mettre du sucre sur ses aliments’)
• Act as noun: (see the second link provided)

Employé is the person who is employed, whereas Employer is the verb meaning ‘to employ’.

Hope this helps!