共産: communism / 協賛: collaboration by companies or groups on events or projects

恐縮:

狂瀾: raging waves; crazy state

響岩: phonolite

Kyūjitai form of 印画紙

(typography) a typestyle that mimics the look of 隷書 (reisho, “clerical script”) being stamped (thus, with broken and irregular strokes) rather than handwritten; this "ancient seal" look arose in Nara-period Japan, and has no relation to the original Chinese 篆書 (tensho, “seal script”)

Proto-Indo-European

Alternative form of イスラム教 (Isuramu-kyō, “Islam”)

Kyūjitai form of 山海経 (“Classic of Mountains and Seas”)

(teacher's) pointer