SELECT "Home team score" FROM table_4473 WHERE "Away team" = 'collingwood'
What is the home team score when the away team is Collingwood?
CREATE TABLE table_4473 (
    "Home team" text,
    "Home team score" text,
    "Away team" text,
    "Away team score" text,
    "Venue" text,
    "Crowd" real,
    "Date" text
)