Data Cleansing- Separating 2 words

Hi, I have a column full of names of streets, I have separated the street names into a first word column and second word column, therefore, for the street name "Adam Road", the first word column contains the word "Adam", the second word column contains the word "Road",

I used the Left and Right formulas to separate the names into two columns e.g. =LEFT(A1,FIND(" ",A1,1)-1) so
"Adam" is placed in column B1, and =RIGHT(A1,LEN(A1)-FIND(" ",A1,1)) so Road is placed in column C2,

My question is for a street name such as "Greenhill", where there is no second word, using the same Left formula gives me the "#VALUE" error, is there a Left formula which can place all first words into a column, regardless of whether the street name contains both two words (e.g. Adam Road") or one word (e.g. Greenhill).

I would very much appreciate the help.