Select the option that can be used as a one-word substitute for the given group of words.

The collection and study of postage stamps

Philately

The option that can be used as a one-word substitute for the given group of words is philately.

• Philately is the collection and study of postage stamps.
• Ornithology is the study of birds.
• Philosophy is the study of the fundamental nature of knowledge, reality, and existence.
• Philanthropy is the love of man or mankind, especially as evidenced by active effort to promote human welfare.