=ARRAYFORMULA(IFERROR(QUERY(IF(SPLIT(A1:A, " ")>0, A1:A, ),
"select Col2,count(Col2)
where Col2 is not null
and Col3=''
group by Col2
label count(Col2)'frequency'"),
QUERY(IF(SPLIT(A1:A, " ")>0, A1:A, ),
"select Col2,count(Col2)
where Col2 is not null
group by Col2
label count(Col2)'frequency'")))