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Hmm vs Um - What's the difference?

hmm | um |

As an initialism hmm

is (computer science) hidden markov model.

As a preposition um is

around, about (sometimes in combination with bi).

As an adverb um is

around, about.

As a conjunction um is

in order to.

hmm

English

Alternative forms

* hm, hmmm, h'm

Interjection

(en interjection)
  • Indicating thinking or pondering.
    • Hmm ... that's an interesting idea.
    Hmm ... I just can't decide between the two.
  • A demand for an answer to a question.
    • ''Just where were you until 2 a.m.? ... Hmm ?

    Synonyms

    * (l)

    Verb

    (en verb)
  • To make a thoughtful humming noise.

    • See also

    * (l) * (l) * (l)

    Anagrams

    * English words without vowels ----

    um

    English

    Etymology 1

    From (etyl) um, from (etyl) um, . More at (l).

    Alternative forms

    * (l), (l)

    Preposition

    (English prepositions)

    • Etymology 2

    (en)

    Alternative forms

    * (l)

    Interjection

    (en interjection)
  • (chiefly, American) Expression of confusion or space filler in conversation. See uh.
    • Um , I don’t know.
    Let’s see... um ... how about this?
  • (chiefly, American)
  • *1963 , (Kurt Vonnegut), Cat's Cradle , Dell Publishing Co., Inc., p. 65:
  • *:"About the same, wherever you go," he agreed.
  • *:"Um ," I said.

    • Verb

    (umm)
  • To make the um sound to express confusion or hesitancy.

    • Etymology 3

    A Latin-script rendering of .

    Noun

    (um)

    • Anagrams

    * English two-letter words ----