Standard word for a pinecone; no special nuance.
I picked up a pinecone in the park.
Commonly used spelling with kana for the second part, avoiding rare kanji.
Kanji spelling using 笠 (bamboo hat), reflecting the shape.
Rare kanji spelling using 毬 (ball), not commonly used.
Rarely used kanji form; 傘 means umbrella.
Compound of 松 (pine) and かさ (from 笠, meaning a conical hat or umbrella-like shape, referring to the shape of a pinecone).