The word "catechizer" is a bit outdated and may not be commonly used in modern English vocabulary. However, there are several synonyms that can be used in its place to convey a similar meaning. Some of these synonyms include instructor, teacher, tutor, educator, mentor, guide, and coach. All of these words indicate someone who imparts knowledge and wisdom onto others. Whether it's through teaching in a classroom setting, providing guidance and support, or sharing expertise in a particular area, each of these synonyms carries a positive connotation and reflects a desire to help others learn and grow.