a monster / a mysterious figure

development or exploitation of natural resources etc. / development or creation of new technology, drugs, or products / development or cultivation of talent or ability

to develop or exploit resources / to develop or create new products or fields / to cultivate talent or ability

change of name

rename; change one's name

(military) navy

(nautical) pirate (one who plunders at sea)

seawater

intervene, step in (an argument), edge in (a market)

Kyūjitai form of 貝殻: shell; seashell