SALE How do I print large as possible on an A4?

I print a maximum font size 72, but I need something more large to fill the page. I am using Microsoft Word and the inkjet printer Dell 720.

In the dropdown list only word that rises to 72, but if you click in the box where the number can write whatever you want, make your font size is 300, if you want.

The following products are available RIGHT NOW ON EBAY!

Large numbered E 13 Granger painting for sale $405.37

LARGE CANVAS RED&YELLOW POPPIES, BEAUTIFUL! ON SALE! $99.99

SPECIAL SALE! TOBIASSE Original Lithograph Great X-Lrg $495.00

Charles Peterson " Yard Sale " Large Size CE S/N $149.00

FACTORY SALE: LARGE WHITE JADE SITTING KWANYIN (A89) $599.00

SALE: LARGE PAIR OF 28" JADE FOODOGS / LION(HJ018K1) $1,999.00

FACTORY SALE: LARGE GREEN JADE TIGER (HJ103E) $2,850.00

FACTORY SALE: LARGE JADE 8 ELEPHANTS MOUNTAIN (J145) $299.99

FACTORY SALE: LARGE JADE SADDLED TANG HORSE (LH2A) $899.99

FACTORY SALE: LARGE JADE SADDLED TANG HORSE (LH3) $899.99

FACTORY SALE: LARGE JADE ELEPHANT (LH9A) $899.00

FACTORY SALE: LARGE SET OF JADE 3 WISEMEN (WJ14) $3,995.00

FACTORY SALE: LARGE JADE SITTING BUDDHA (LH10) $899.99

FACTORY SALE: LARGE JADE SITTING BUDDHA (A69) $599.99

FACTORY SALE: LARGE JADE ELEPHANT (LH9B) $599.00

Antique Large Oil Painting for Sale $500.00