Feeling, the general term, denotes a partly mental and partly physical, but not primarily sensory, reaction or state that is characterized by an emotional response (as pleasure, pain, attraction, or repulsion). Unless it is qualified or a clue is given in the context, feeling gives no indication of the nature, the quality, or the intensity of the response.
Often feeling implies a contrast with judgment and connotes lack of thought.
Affection is applied mainly to such feelings as are also inclinations or likings; the word therefore sometimes suggests desire or striving.
Emotion usually suggests a condition that involves more of the total mental and physical response than does feeling or implies feelings marked by excitement or agitation.
Sentiment connotes a larger intellectual element in the feeling than any of the others; it often is applied specifically to an emotion inspired by an idea. Commonly the word suggests refined, sometimes romantic, occasionally affected or artificial, feeling.
Passion suggests powerful or controlling emotion; more than affection, it implies urgency of desire (as for possession or revenge).