Reminiscence vs. Nostalgia: What's the Difference?

Reminiscence and Nostalgia Definitions
Reminiscence
The act or process of recollecting past experiences or events.
Nostalgia
A bittersweet longing for things, persons, or situations of the past.
Reminiscence
An experience or event recollected
"Her mind seemed wholly taken up with reminiscences of past gaiety" (Charlotte Brontë).
Nostalgia
The condition of being homesick; homesickness.
Reminiscence
Often reminiscences A narration of past experiences.
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Nostalgia
A longing for home or familiar surroundings; homesickness.
Reminiscence
An event that brings to mind a similar, former event.
Nostalgia
(transferred sense) A bittersweet yearning for the things of the past.
Reminiscence
An act of remembering long-past experiences, especially positive or pleasant ones, often fondly.
Nostalgia
Homesickness; esp., a severe and sometimes fatal form of melancholia, due to homesickness.
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Reminiscence
A mental image thus remembered.
Nostalgia
A sentimental yearning to return to an earlier time remembered as happier or more pleasant, or a former place evoking happy memories; a longing to experience again a former happy time; as, a nostalgia for the brotherhood of the Woodstock music festival; a nostalgia for the comradeship of one's college friends.
Reminiscence
The act or power of recalling past experience; the state of being reminiscent; remembrance; memory.
The other part of memory, called reminiscence, which is the retrieving of a thing at present forgot, or but confusedly remembered.
I forgive your want of reminiscence, since it is long since I saw you.
Nostalgia
Longing for something past
Reminiscence
That which is remembered, or recalled to mind; a statement or narration of remembered experience; a recollection; as, pleasing or painful reminiscences.
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Reminiscence
A mental impression retained and recalled from the past
Reminiscence
The process of remembering (especially the process of recovering information by mental effort);
He has total recall of the episode