pneumococcus/nyoohmohʹkokəs/ noun (pl pneumococci /-ʹkok(s)ie/)

• dietetics
• dietitian
• die with one's boots on
• differ
• difference
• different
• differentia
• differential
• differential calculus
• differential equation
• differential gear
• differentiate
• differentiation
• difficult
• difficulty
• diffident
• diffract
• diffraction grating
• diffuse
• diffusion
• diffusionism
• dig
• digastric
• digerati
• digest