Among NSAIDs aspirin is unique because it:

Aspirin is the only irreversible COX inhibitor. Most NSAIDs can reduce the risk of colon cancer. Selective COX-2 inhibitors like celecoxib are used to prevent risk of colon cancer in patients with familial adenomatous polyposis coli. All NSAIDs have anti-pyretic activities. Selective COX-2 inhibitors include celecoxib, etoricoxib like drugs Aspirin is non-selective COX inhibitor.