的 and 勺 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in older Chinese.的 /*[t-l]ˤewk/ 勺 /*m-tewk/, /*tewk/
possessive, adjectival suffix; of; ~'s (possessive particle); (used after an attribute); (used to form a nominal expression); (used at the end of a declarative sentence for emphasis)