Learn English – Meaning of very purpose

I was inclined to suggest that this was a general reference question, yet the answer wasn't obvious to me either! Here we go, in a variety of contexts, which is why the question is of interest to me too.

English usage and definition
Do purpose and reason mean the same thing?

To do something for a purpose means you're doing it to accomplish something else, which is your PURPOSE. Accomplishing a purpose is only one of many reasons why we do something--in this case, REASON is more like "motive."

A reason can be trivial or illogical. One can purchase something for the reason that one likes how it looks e.g. I might buy sky-blue colored suede, open-toe, high-heel pumps because they're cute, but that won't accomplish the ultimate purpose in buying footwear, which is to facilitate walking.

Philosophical
The reason for which something is done, or the reason it is done in a particular way, is the purpose. Reason motivates action.

Grammatical
Purpose and reason are neither synonyms, nor antonyms, which was part of the question. As a part of speech, both words are nouns. That is the similarity. This is the difference:

Purpose is the reason for which something is done or created or for which something exists while Reason is a cause, explanation or justification for an action or event.

Side bar: It is more appropriate to say "The reason for blah is blahblah". Usage is context-specific with "purpose" e.g. "The purpose of blah..." versus "The purpose for blah...".

quippy

Joky; inclined to or characterised by quipping.

quip

1. A clever, witty remark often prompted by the occasion.
2. A clever, often sarcastic remark; a gibe.

It can be used endearingly, as well as pejoratively, but also in both ways simultaneously (as determined by the context):

• A couple so quippy and witty that I almost want to see them as supporting roles in every rom-com I can.
• So funny. So quippy. So utterly watchable.
• I think that's where Spidey works very well because he is so quippy and so funny.
• were all people in the 1940s so quippy or is it just his Captain America?
• Waid writes a comic called Ruse that I love, it ... the detective’s assistant, Emma Bishop, is such a great character. She comes off as smart even when she’s next to this super-genius, she’s really quippy and active in the story. She’s great, and
• It helps that he is quippy, sexy, and intense. Again, who doesn't love Spike? Buffy- Buffy is so complicated.
• She is so quippy and clever and I SO want to BE quippy and clever!
• I wish that I was funny. You know those people who just are babbling along and people around them are dying laughing? I am not one of them. Or, maybe it would be great to be like someone who was really quippy, like Lorelai Gilmore. She always knows what to say, but then again (as it was pointed 0ut to me yesterday) she isn’t real, and it took someone days, weeks, or maybe months to write what she says. Is anyone really that sharp and quick on their feet?
• My best friend, who I absolutely love and adore is starting to become really quippy and she puts me down all the time. Believe me I KNOW that she is joking and we are extremely close so I guess of all people she has the most agency to make these jokes, but at the same time it has gotten to the point where she rarely says nice things to me and her "jokes" are really getting to me.
• OK, if I wanted to be really quippy, I'd say "Since I'm looking for interesting or intelligent engagement with folks, I'm looking for that which isn't here all right." But that's just because I am frustrated.

(all the examples are googlable)

Edit:

Yeah, as one of the sentences calls it to attention:

quick on one's feet

sharp-witted

clever, keen of intellect, swift of thought.