Quick answer
"Dos mil" is an adjective which is often translated as "two thousand", and "dieciocho" is a noun which is often translated as "eighteen". Learn more about the difference between "dos mil" and "dieciocho" below.
dos mil(
dohs
 
meel
)
An adjective is a word that describes a noun (e.g. the big dog).
1. (number)
a. two thousand
Hay dos mil especies de insectos en estos bosques.There are two thousand species of insects in this woods.
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dieciocho(
dyeh
-
see
-
oh
-
choh
)
An adjective is a word that describes a noun (e.g. the big dog).
1. (number)
a. eighteen
Voy por la página dieciocho.I'm on page eighteen.
A masculine noun is used with masculine articles and adjectives (e.g. el hombre guapo, el sol amarillo).
2. (number)
a. eighteen
Nueve por dos son dieciocho.Nine times two is eighteen.
b. eighteenth (in dates)
Su cumpleaños es el dieciocho de mayo.Her birthday is on the eighteenth of May.
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