• 博士はかせ — doctorate holder
• 博物館はくぶつかん — museum
• 博覧会はくらんかい — exposition; fair
• 博学はくがく — erudition
• 博愛はくあい — philanthropy
• 博士はくし — doctoral degree holder (reading alt.)

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博 is a phono-semantic compound: the structure includes the radical 十 and the phonetic 尃 (ハク). The core sense is “broad / extensive,” leading to meanings like wide learning, public exhibitions, and advanced degrees.