• agree upon,
• zgree up on,
• sgree up on,
• wgree up on,
• qgree up on,
• afree up on,
• avree up on,
• abree up on,
• ahree up on,
• ayree up on,
• atree up on,
• ageee up on,
• agdee up on,
• agfee up on,
• agtee up on,
• ag5ee up on,
• ag4ee up on,
• agrwe up on,
• agrse up on,
• agrde up on

The adjective form of "agree upon" is "agreed upon".