Rigorous is defined as adhering to a way of doing something in a strict or inflexible manner. Rigorous also denotes thorough or accurate way, whereas vigorous defines the energetic attribute, it means lively...

Comment is a remark that is used to express an opinion or reaction, whereas a compliment is used to express praise, commendation, or admiration.

A state is a territorially bound political unit with centralized institutions for the administration of governance, whereas an estate can be defined by the all the assets of a person at any point in time.

Cynicism reflects a contemptuous or mocking attitude of various ideas or solution, whereas criticism defines the judging attitude and in modern world it is often taken as a negative opinion.

Lodging is a facility that is provided for the accommodation, whereas boarding includes both the food and accommodation facility.