What do HTTP status codes 200 and 500 mean, and what are their peg words?

200 → "noses" (n·s·s); 500 → "losses" (l·s·s).

• 200 OK — the request succeeded. 2·0·0 = /n/·/s/·/s/ → noses.
• 500 Internal Server Error — the server hit an unexpected fault. 5·0·0 = /l/·/s/·/s/ → losses.

Together: a nose (200) that's all wins, a loss (500) when it breaks. The first digit of an HTTP code marks its class: 2xx success, 4xx client error, 5xx server error.