Sino-Korean vs Native Vocabulary (한자어 vs 고유어)

Korean vocabulary runs on two parallel tracks, and a learner has to feel the difference between them the way a good English speaker feels the difference between "ask" and "inquire." One track is native Korean (고유어) — the inherited, everyday words. The other is Sino-Korean (한자어) — words built from Chinese roots, borrowed over centuries and now roughly 60% of the dictionary. The two tracks frequently cover the same idea at different registers, giving Korean pairs of words (doublets) where one is homey and the other is formal, technical, or respectful. Learning which track a word belongs to isn't trivia: it controls politeness, it decides which of the two number systems you use, and it's the difference between sounding natural and sounding either childish or stiff.

The English parallel: Anglo-Saxon vs Latinate

If this feels abstract, it maps almost perfectly onto a split English speakers already own. English has homey Anglo-Saxon words and fancy Latinate ones for the same concept: ask / inquire, help / assist, begin / commence, end / terminate. The Latinate member sounds more formal, more written, more technical. Korean's split works the same way, with 고유어 playing the "Anglo-Saxon" role and 한자어 the "Latinate" role — Sino-Korean generally sounds more formal, more academic, and more at home in writing.

Watch the register do its work. To an elder you ask about their 연세, not their 나이; you request their 성함, not their 이름:

But about yourself, or with a peer, you switch to the native words — using 연세 or 성함 about yourself would be like calling your own house a "residence":

Notice too that the honorific members are overwhelmingly Sino-Korean: 연세, 성함, 댁 (home), 진지 (meal), 분 (person) are all 한자어. The honorific noun set leans heavily on this stratum, which is one more reason to track which words are Sino.

Even a plain 식사 vs 밥 choice shifts the tone — 식사하셨어요? is the polished, considerate version of "have you eaten?":

Sino roots recombine like Latin roots

The Sino-Korean stratum has the same superpower as English's Latin and Greek roots: the morphemes recombine productively. A single root such as 학 ("study / learning") generates a whole family:

Once you can spot recurring roots (학 study, 국 country, 어 language, 인 person, 생 life/person), Sino-Korean vocabulary starts to feel systematic instead of arbitrary — you decode new words the way you'd decode "biography" from "bio" + "graphy."

The big consequence: two number systems

The single most practical effect of this two-strata system is that Korean has two complete sets of numbers, and you must switch between them by context:

• Native numbers (하나, 둘, 셋, 넷, 다섯...) — covered in the native numbers overview
• Sino-Korean numbers (일, 이, 삼, 사, 오...) — covered in the Sino numbers overview

They are not interchangeable. Each counter and context is wired to one system, and using the wrong one is a jarring error. The rough division:

The clearest demonstration is telling time, which uses both systems in one breath — native for the hour, Sino for the minutes:

And age shows the strata interacting with honorifics: the honorific age noun 연세 is Sino, but the counting of age still uses native numbers plus the native counter 살:

The logic of matching each counter to its number system is developed on the which-number-system-per-counter page.

Common Mistakes

1. Crossing the number wiring — native number on a Sino-only counter. Minutes take Sino numbers.

• ✗ 다섯 분 (native 다섯 with minute counter 분, for "five minutes")
• ✓ 오 분 — o bun — "five minutes"

2. Crossing it the other way — Sino number on a native counter. Hours take native numbers.

• ✗ 삼 시 (Sino 삼 for "3 o'clock")
• ✓ 세 시 — se si — "3 o'clock"

3. Sino number for age. Age uses native numbers with 살.

• ✗ 십 살 (Sino 십 for "ten years old")
• ✓ 열 살 — yeol sal — "ten years old"

4. Using an honorific Sino noun about yourself. 연세, 성함, 진지 are for showing respect to others, never for your own age/name/meal.

• ✗ 제 연세는 서른이에요. (elevating your own age)
• ✓ 제 나이는 서른이에요. — je naineun seoreun-ieyo — "I'm thirty."

5. Using a plain native word where formality is expected. In a polite inquiry to an elder, the native 나이/이름 sounds blunt.

• ✗ (to an elder) 나이가 몇 살이에요? (plain, too direct)
• ✓ 연세가 어떻게 되세요? — yeonsega eotteoke doeseyo — "May I ask your age?"

Key Takeaways

• Korean vocabulary has two strata: native (고유어) and Sino-Korean (한자어), often as register doublets (나이/연세, 이름/성함, 밥/식사) — native homey, Sino formal/technical/honorific. It parallels English's Anglo-Saxon vs Latinate split.
• Sino roots recombine productively (학 → 학생, 학교, 대학, 학원), so the stratum decodes like Latin/Greek roots.
• The split powers two number systems: native (hours 시, age 살, things 개, people 명) vs Sino (minutes 분, money 원, dates, phone numbers). Time uses both at once: 세 시 십 분.
• Honorific nouns are overwhelmingly Sino (연세, 성함, 댁, 진지) and are for others, not yourself. The classic error is crossing the number wiring (×다섯 분) — log each counter with its number system.